Strikeforce: Shamrock vs. Gracie was the inaugural mixed martial arts event promoted by Strikeforce. The event took place at the HP Pavilion at San Jose in San Jose, California on March 10, 2006. The main event was the long awaited match between Frank Shamrock, returning to the sport after a 3-year absence, and Cesar Gracie. The show is also notable for featuring the MMA debut of Cung Le. This was the first Strikeforce event.

Strikeforce: Revenge was the second mixed martial arts event promoted by Strikeforce. The event took place at the HP Pavilion at San Jose in San Jose, California on June 9, 2006. The main event featured the North American debut of Alistair Overeem.

UFC 21: Return of the Champions was a mixed martial arts event held by the Ultimate Fighting Championship on July 16, 1999 at the Five Seasons Events Center in Cedar Rapids, Iowa. The event was seen live on pay per view in the United States, and later released on home video.

UFC 23: Ultimate Japan 2 was a mixed martial arts event held by the Ultimate Fighting Championship on November 19, 1999 at Tokyo Bay NK Hall in Tokyo, Japan.

UFC 25: Ultimate Japan 3 was a mixed martial arts event held by the Ultimate Fighting Championship on April 14, 2000 at the Yoyogi National Gymnasium in Tokyo, Japan.

UFC 27: Ultimate Bad Boyz was a mixed martial arts event held by the Ultimate Fighting Championship on September 22, 2000 at Lake Front Arena in New Orleans, Louisiana.

UFC 33: Victory in Vegas was a mixed martial arts event held by the Ultimate Fighting Championship at the Mandalay Bay Events Center on the Las Vegas Strip in Las Vegas, Nevada on September 28, 2001. The event was seen live on pay per view in the United States, and later released on home video.

UFC 35: Throwdown was a mixed martial arts event held by the Ultimate Fighting Championship at the Mohegan Sun Arena in Uncasville, Connecticut on January 11, 2002. The event was seen live on pay per view in the United States, and later released on home video.

UFC 38: Brawl at the Hall was a mixed martial arts event held by the Ultimate Fighting Championship. It took place at the Royal Albert Hall in London, England, on July 13, 2002. The event was seen on pay per view in the United States, and was later released on home video.

Strikeforce: Triple Threat was the fourth mixed martial arts event promoted by Strikeforce. The event took place at the HP Pavilion at San Jose in San Jose, California on December 8, 2006. The main card featured the Strikeforce debut of Gina Carano.